Long Waves at Manukau Harbour

The figures below show the latest data presented in two different ways.
Figure 1A is the raw long-wave record. Figure 2A is the same record, but with the
background noise removed to leave only the significant long waves.
Figures 2B and C show the individual heights and periods of those waves.
Figure 1B is a contour plot showing how the wave height is distributed with time and period.